CVS Health CEO Larry MerloCNBC CVS Health on Sunday said it's acquiring Aetna in a $69 billion deal.  The move could upend the way we pay for healthcare, with Aetna and CVS aiming to make pharmacies the "new front doors of healthcare."  The hope is that by combining the two companies, CVS and Aetna may be able to keep healthcare spending from increasing as much as it has.  CVS Health and Aetna are merging, in what's the largest deal of 2017.  The $69 billion deal creates a new type of company that includes a health insurer, a retail pharmacy, and a company that negotiates prescription drug prices with drugmakers called a pharmacy benefits manager.  The merger is intended to shift the way consumers interact with their healthcare. Both CVS CEO Larry Merlo and Aetna CEO Mark Bertolini said the plan is to make pharmacies the "new front doors of healthcare" — as opposed to a traditional doctor's office or a hospital.  "It was clear that CVS Health was moving to become more of a healthcare company and getting closer to the payers, Mark had a similar strategy in getting closer to the customer," Merlo told CNBC on Monday.  Bertolini recalled on CNBC a conversation he had with Merlo two years ago, in which Merlo said "Every time I do something to save — to you know, improve health, I lose revenue, and you make money." Bertolini responded: "And I said you've got the wrong revenue model. Wouldn't it be better if we could share risk in a way that would allow us to benefit you as a result as what you do to improve people's health?" Now, with both companies under the same roof, that's a possibility. The hope is that a combined company will find ways to curb healthcare spending. "More’s needed to truly impact the trajectory of healthcare spending," Merlo said in a call with investors on Monday.  Visiting the pharmacy While CVS might be best-known for its roughly 10,000 pharmacies around the US, CVS as a company operates a number of different businesses, including a pharmacy benefits manager, its MinuteClinic health clinics that are staffed by health care professionals, specialty pharmacy fulfillment and management services, mail prescription services, and long-term care